... its like anything else, you have highly skilled and meticulous artists and you have people who just do what it takes to make a buck. While the larger dents are not always "perfect" as you state, high 90% repairs can regularly be achieved if the time is spent.
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Since most cars these days are only kept for a few years 90% is perfectly acceptable to the vast majority of people. It's very important to find out customers expectations and let them know what to expect before any work is performed.

I think we are agreeing here. I've seen a number of PDRs. Many were just clearly-better-than-before the PDR, which is "good enough" for most people. Some were quite good (pass the 10' test). In fact, I'd say that a very good PDR fix generally looks better than a mediocre traditional repair.

PDR is great after a bad hail storm, before returning a lease, or trading in or reselling. It is also ideal for an older car that is too nice to let stay ugly, but may not be quite nice enough to justify $2000 (or more) for cosmetics.

PDR does cost much less than body work. And, like body work, skill plays a very large part in the results. As you noted, setting expectations is key. What many people know of PDR makes it seem like magic...and they expect magical results.